Project Documentation

Arduino UNO Based Health Monitoring System with GSM Reporting

Circuit Documentation

Summary

The circuit is designed to monitor various health parameters using an array of sensors, including a GSR sensor, an AD8232 heart rate monitor, a DFRobot DHT22 temperature and humidity sensor, a Myoware 2.0 muscle sensor, and a SIM800L GSM module for communication. The Arduino UNO serves as the central microcontroller, interfacing with the sensors and controlling a relay module, a buzzer, and an LED indicator. The data collected from the sensors is displayed on a 16x2 I2C LCD and can be sent via SMS using the GSM module. The circuit is powered by a 12V power supply, with the Arduino regulating the voltage for the other components.

Component List

Arduino UNO: A microcontroller board based on the ATmega328P, featuring digital and analog I/O pins.
GSR SENSOR: A sensor for measuring galvanic skin response, which can be an indicator of stress or emotional arousal.
AD8232 Heart Rate Monitor: A cost-effective board used to measure the electrical activity of the heart.
DFRobot DHT22 Temperature & Humidity Sensor V2: A sensor for measuring ambient temperature and humidity.
16x2 I2C LCD: A liquid crystal display that can show 16 characters per line on 2 lines, with an I2C interface for communication.
SIM800L: A GSM/GPRS module that allows for SMS and voice communication.
12V Power Supply: Provides the necessary power to the circuit.
Myoware 2.0 Muscle Sensor: A sensor that measures muscle activity.
RELAY MODULE: An electrically operated switch that allows for controlling high power devices.
Buzzer Module: An electronic sounder that can be used for alerts or alarms.
LED: Two Pin (red): A basic red LED for indication purposes.
Resistor: A 220 Ohm resistor, typically used for current limiting in LED circuits.

Wiring Details

Arduino UNO

5V: Powers the 16x2 I2C LCD, SIM800L, Buzzer Module, DFRobot DHT22 Sensor, and RELAY MODULE.
3.3V: Powers the AD8232 Heart Rate Monitor and Myoware 2.0 Muscle Sensor.
GND: Common ground for all components.
Vin: Connected to the positive terminal of the 12V power supply.
A0: Receives analog input from the GSR SENSOR.
A1: Receives analog input from the AD8232 Heart Rate Monitor.
A2: Connected to the SDA pin of the 16x2 I2C LCD for data communication.
A3: Connected to the SCL pin of the 16x2 I2C LCD for clock communication.
A5: Receives analog input from the Myoware 2.0 Muscle Sensor.
D11: Connected to the TXD pin of the SIM800L for serial communication.
D10: Connected to the RXD pin of the SIM800L for serial communication.
D9: Connected to one end of the 220 Ohm resistor.
D8: Connected to the I/O pin of the Buzzer Module.
D7: Connected to the INPUT pin of the RELAY MODULE.
D2: Connected to the Signal pin of the DFRobot DHT22 Sensor.

GSR SENSOR

OUT: Connected to the A0 pin on the Arduino UNO.

AD8232 Heart Rate Monitor

OUTPUT: Connected to the A1 pin on the Arduino UNO.

DFRobot DHT22 Temperature & Humidity Sensor V2

Signal: Connected to the D2 pin on the Arduino UNO.

16x2 I2C LCD

SDA: Connected to the A2 pin on the Arduino UNO.
SCL: Connected to the A3 pin on the Arduino UNO.

SIM800L

TXD: Connected to the D11 pin on the Arduino UNO.
RXD: Connected to the D10 pin on the Arduino UNO.

Myoware 2.0 Muscle Sensor

ENV: Connected to the A5 pin on the Arduino UNO.

RELAY MODULE

INPUT: Connected to the D7 pin on the Arduino UNO.

Buzzer Module

I/O: Connected to the D8 pin on the Arduino UNO.

LED: Two Pin (red)

anode: Connected to the other end of the 220 Ohm resistor.
cathode: Connected to the common ground.

Resistor

pin1: Connected to the D9 pin on the Arduino UNO.
pin2: Connected to the anode of the red LED.

Documented Code

#include <DHT.h>
#include <LiquidCrystal_I2C.h>
#include <SoftwareSerial.h>

// Pin Definitions
const int gsrPin = A0;         // GSR Sensor
const int ecgPin = A1;         // ECG Sensor
const int dhtPin = 2;          // DHT22
const int emgPin = A5;         // EMG Sensor
const int relayPin = 7;        // Relay for steam generator
const int buzzerPin = 8;       // Buzzer
const int ledPin = 9;          // Red LED

// GSM Module Pins
SoftwareSerial gsmSerial(10, 11); // RX, TX

// DHT Sensor Initialization
DHT dht(dhtPin, DHT22);

// LCD Display Initialization
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Timing Variables
unsigned long startTime;
const unsigned long maxDuration = 20 * 60 * 1000; // 20 minutes
const unsigned long alertTime = 15 * 60 * 1000;   // 15 minutes

void setup() {
  Serial.begin(9600);
  gsmSerial.begin(9600);
  dht.begin();
  pinMode(relayPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
  digitalWrite(relayPin, LOW); // Turn off steam generator
  digitalWrite(buzzerPin, LOW); // Turn off buzzer
  digitalWrite(ledPin, LOW);    // Turn off LED
  lcd.begin(16, 2); // Initialize the LCD with 16 columns and 2 rows
  lcd.backlight();
  startTime = millis();
}

void loop() {
  unsigned long currentTime = millis();
  if (currentTime - startTime >= maxDuration) {
    digitalWrite(relayPin, LOW); // Turn off steam generator
    return; // Stop the loop after 20 minutes
  }
  if (currentTime - startTime >= alertTime) {
    digitalWrite(buzzerPin, HIGH); // Turn on buzzer
  }
  // Read Sensors
  int gsrValue = analogRead(gsrPin);
  int ecgValue = analogRead(ecgPin);
  float temperature = dht.readTemperature();
  int emgValue = analogRead(emgPin); // Read EMG sensor
  // Control Steam Generator based on Temperature
  if (temperature < 40) {
    digitalWrite(relayPin, HIGH); // Turn on steam generator
  } else if (temperature > 46) {
    digitalWrite(relayPin, LOW);  // Turn off steam generator
  }
  // Stop steam generator if hydration exceeds limit
  if (gsrValue > 600) { // Example threshold
    digitalWrite(relayPin, LOW); // Turn off steam generator
    digitalWrite(buzzerPin, HIGH); // Turn on buzzer
    digitalWrite(ledPin, HIGH);    // Turn on LED
  }
  // Prepare data for GSM
  String message = "GSR: " + String(gsrValue) +
                   ", ECG: " + String(ecgValue) +
                   ", Temp: " + String(temperature) +
                   ", EMG: " + String(emgValue);
  // Send data via GSM
  sendSMS(message);
  // Display on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: " + String(temperature) + "C");
  lcd.setCursor(0, 1);
  lcd.print("GSR: " + String(gsrValue));
  delay(2000); // Update every 2 seconds
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("ECG: " + String(ecgValue));
  lcd.setCursor(0, 1);
  lcd.print("EMG: " + String(emgValue));
  delay(2000); // Update every 2 seconds
}

void sendSMS(String message) {
  gsmSerial.println("AT+CMGF=1"); // Set SMS mode
  delay(100);
  gsmSerial.print("AT+CMGS=\"+1234567890\""); // Replace with doctor's phone number
  delay(100);
  gsmSerial.println(message); // Message content
  delay(100);
  gsmSerial.write(26); // Send Ctrl+Z to send SMS
  delay(100);
}

This code is responsible for initializing the sensors and communication modules, reading sensor data, controlling the relay,